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Note Transfers of financial assets and servicing assets (Initial fair value of assets obtained as proceeds from residential mortgage loans securitized) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | $ 516,022 | $ 468,931
GNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 413,000 | 376,000
FNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 94,000 | 86,000
Trading account debt securities |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 494,820 | 445,984
Trading account debt securities | GNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 412,500 | 376,186
Trading account debt securities | FNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 82,320 | 69,798
Mortgage Servicing Rights |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 9,337 | 6,898
Debt securities available-for-sale |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 11,865 | 16,049
Debt securities available-for-sale | FNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 11,865 | 16,049
Level 1 |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0
Level 1 | Trading account debt securities |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0
Level 1 | Trading account debt securities | GNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0
Level 1 | Trading account debt securities | FNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0
Level 1 | Mortgage Servicing Rights |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0
Level 1 | Debt securities available-for-sale |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0
Level 1 | Debt securities available-for-sale | FNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0
Level 2 |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 506,685 | 462,033
Level 2 | Trading account debt securities |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 494,820 | 445,984
Level 2 | Trading account debt securities | GNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 412,500 | 376,186
Level 2 | Trading account debt securities | FNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 82,320 | 69,798
Level 2 | Mortgage Servicing Rights |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0
Level 2 | Debt securities available-for-sale |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 11,865 | 16,049
Level 2 | Debt securities available-for-sale | FNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 11,865 | 16,049
Level 3 |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 9,337 | 6,898
Level 3 | Trading account debt securities |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0
Level 3 | Trading account debt securities | GNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0
Level 3 | Trading account debt securities | FNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0
Level 3 | Mortgage Servicing Rights |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 9,337 | 6,898
Level 3 | Debt securities available-for-sale |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | 0 | 0
Level 3 | Debt securities available-for-sale | FNMA |  |
Assets |  |
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized | $ 0 | $ 0

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